It was branded ‘hair-brained’ by the so-called professionals on Dragon’s Den famed for their ruthless ability to sort the bad investments from the good.

But this is the product that eluded the hard-faced gang and went on to make a whopping fortune without them.

At the time, Duncan Bannatyne claimed that the Tangle Teezer hairbrush left him wanting to pull his hair out – well, we bet he feels even more like that now that he realises what he’s missed out on.

The product, which is designed to work through wet and knotted hair, detangling it without any pain or trouble, is a hit worldwide and is now estimated to be worth an eye-watering £65million.

Entrepeneur Shaun Pulfrey offered the Dragons a 15% stake in his company for an £80,000 investment and he was unanimously rejected and mocked by the panel.

Who’d have thought a brush would be worth millions? (Picture: Tangle Teezer)

James Caan blasted the product as a ‘waste of time’ while Peter Jones quipped that it was ‘hair-brained’.

Who’s laughing now though, guys?

Dunc wanted to pull his hair out (Picture: BBC)

Sold in over 70 countries, Tangle Teezer is also a hit with many high profile celebs with Victoria Beckham, Emma Watson and Cara Delevingne allegedly among showbiz fans of the product.

YouTube is awash with positive product reviews on it, including this slightly excitable one from Bargain Princess:

In order to raise the cash he needed that was not provided by the Dragons, Pulfrey re-mortgaged his home and his risk paid off.

Speaking about the experience, he humbly told MailOnline: ‘Entrepreneurs do things differently. Businessmen are less likely to take risks and I think you can see that with the Dragons.

‘Looking back on it there really isn’t a lot that I would change.

Now we know how Emma gets her hair so sleek (Picture: REX)

‘At the end of the day, for me, I gained a lot of expertise from it and it has helped bring together the great team I have now. Fast forward to now and we’ve just turned over £23.4million, the forecast for this year is that we’re going to hit £34million.’